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A literature review and case report of hand, foot and mouth disease in an immunocompetent adult
BMC Research Notes volume 9, Article number: 165 (2016)
To report an uncommon case of hand, foot and mouth disease, (HFMD) in an immunocompetent adult; a highly infectious disease, characterized by the appearance of vesicles on the mouth, hands and feet, associated with coxsackieviruses and enteroviruses; including a literature review.
A 23 year Caucasian male with no medical or surgical history, no allergies, was not taking any medication and smoked ten cigarettes a day, suffering from discomfort in the oral cavity; itching, burning and pain when swallowing associated with small erythematous lesions located on the hard palate, and small ulcers in tonsillar pillars and right buccal mucosa. Mild fever of 37.8 °C and general malaise. The patient reported he had had contact with a child diagnosed with HFMD. From his background and symptoms, the patient was diagnosed with HFMD. Following symptomatic treatment, the symptoms remitted in 7 days.
A literature review in MEDLINE (PubMed). The inclusion criteria were for studies on humans over the last 5 years, using the keywords HFMD.
We found 925 articles, which were subsequently reduced to 52 documents after applying the inclusion criteria. Maculopapular lesions were found on hands and feet.
Dentists may have a key role diagnosing the disease. A surveillance system to predict future outbreaks, encourage early diagnosis, put appropriate public health measures in place and research vaccine development is vitally important in order to control the disease.
In 1958, Robinson et al. first described the outbreak of a highly infectious disease in Toronto in 1957, characterized by the appearance of vesicles on the mouth, hands and feet . It was isolated coxsackievirus (CV) A16. Hand foot and mouth disease (HFMD) rarely appears as an epidemic infectious disease. However it is the most common infectious disease in China, with an incidence rate of around 500,000–1,000,000 cases per year . It is associated with climate changes, usually occurring in spring and summer . It occurs most often in children between 0 and 5 years old [4, 5] and immunocompromised adults , due to their high sensitivity to the enterovirus 71 (EV71) and CVA16 . However, it can also occur in immunocompetent adults [5, 6]. Some of the major causative agents are EV71, CVA16 , and it was recently described, CVA6 and CVA10 [9–11].
The main routes of transmission are person-to-person (through oral-pharyngeal secretions or by direct vesicle contact), via contaminated water (fecal-oral route) , and via contaminated objects.
The incubation period is short, ranging from 2 to 7 days. It shows non-specific symptoms, but there may be mild fever and catarrhal manifestations. The initial viral implantation is in the oral cavity and ileum, spreading to the regional lymph nodes within 24 h. Viremia occurs after 72 h, followed by secondary infection and viral seeding in areas such as the oral mucosa, hands and feet. On the seventh day, there is an increase in antibody levels and the disease begins to disappear .
Oral lesions are the first clinical signs of the disease, and are sometimes the only sign, because they appear even before the lesions on the extremities . Manifestations of the disease on the skin consist of multiple lesions on the hands and feet, and occur concurrently or shortly after the oral lesions. Systemic features are summarized in the Table 1 [13, 14].
A study in Japan suggests the possibility that the HFMD could also cause opsoclonus-myoclonus (jerky eye movements in all directions) as a possible viral or autoimmune response , other studies reports cases of retinopathy and vision loss in this entity .
The diagnosis is by observing the clinical signs of the disease, such as fever and the characteristic lesions on the hands, feet and mouth. Confirmation of diagnosis is carried out by isolating the virus responsible for the disease, or by identifying virus-neutralizing antibodies in patient serum .
There are varieties of studies investigating possible treatments for HFMD. One such study considers using intravenous immunoglobulin (IVIG) as therapy against HFMD [17, 18]. However, because the disease is self-limiting in nature and due to the lack of a virus-specific therapy, the present treatment is symptomatic. Non-specific rinses with anesthetic substances can be employed to relieve oral discomfort. In addition, ensure that the patient gets plenty of fluids and avoids spicy and acidic foods, and foods that require a lot of chewing.
In most cases, the prognosis is good moving toward spontaneous healing within 7–10 days without sequelae, scabs or scars. However, there have been reports of onychomadesis associated with the disease [19–21], in addition to neurological disorders such as meningitis (EV-4) , Guillain–Barre syndrome, meningoencephalitis, as well as paralytic polio, myoclonus and somnolence, mainly caused by the sub genotype C4aEV71 , in children under 5 years (the main risk group in the population) . It has been shown that most of these patients have low levels of vitamin A, associated with reduced immunity, and they are therefore more susceptible to a more severe manifestation of the disease . Note also that delays in access to health services lead to an increased likelihood of a more severe form of the disease [4, 26, 27].
The aim of this article is to present a case of HFMD in an immunocompetent adult, alongside a literature review. The article also aims to identify the etiologic agents and publicize transmissible factors in order to correctly diagnose patients, and thus to establish an effective treatment plan both individually and collectively.
In May 2014, coinciding with the springtime, a 23 year Caucasian male went to the Odontology Hospital of the University of Barcelona. He had no familiar, medical or surgical history, no allergies, not taking any medication and smoked ten cigarettes a day. He was suffering from discomfort in the oral cavity: itching, burning and pain when swallowing associated with small erythematous lesions located on the hard palate, and small ulcers in tonsillar pillars and right buccal mucosa. The patient had a mild fever of 37.8 °C and general malaise. The examination also found maculopapular lesions on the hands and feet, some of which were in the form of blisters (Figs. 1, 2 and 3). Upon questioning the patient, he stated that a few days earlier (7–10 days), he had been in contact with a 2-year-old girl who was diagnosed with HFMD, and that other members of the child’s family had suffered the same symptoms.
From his background and symptoms, the patient was diagnosed with HFMD and symptomatic treatment was begun with analgesics (650 mg paracetamol three times a day), hygiene, and a diet that would not irritate the symptoms further. The patient controlled the symptoms for 7 days until the disease subsided. An analytical control was requested in which no evidence of any significant alteration was shown. We conducted a follow-up visit after 15 days and did not find any residual lesions.
Methods and results
A literature review was performed via an automated search for information on the database: MEDLINE (PubMed) to identify and summarize all relevant publications on HFMD. The search strategy was based on the terms HFMD. The inclusion criteria was for studies on humans, over the last 5 years that identify the etiologic agents, disclose communicable factors, correctly diagnose the patients, and establish an effective treatment plan both individually and collectively. We assessed the eligibility of articles from the titles and abstracts, and extracted the information related to our target subject. We also included an article by Delgado et al. , as well as two older articles for their importance to the history of the disease: Robinson et al. , and Alsop et al. .
We found 925 publications in PubMed with the keywords listed, of which 627 were based on humans and published in the last 5 years, which was reduced to 92, when we limit the search to studies in adults. We selected 49 papers that met the objectives of our research and the inclusion criteria. We included 26 of the 52 total papers as a systematic review, based in the number of cases presented and type of studies, and addressing the issues developed: the relationship between climate changes and HFMD, causes, complications and epidemiological studies on severe forms of HFMD, the remaining papers was included for the discussion and development of theme (Fig. 4).
HFMD is a syndrome caused by intestinal viruses from the Picornaviridae family, and is mainly characterized by the appearance of vesicular lesions on the mouth, hands and feet. It is more common in children under 10 and in vulnerable adults. Nonetheless, it can also occur in young immunocompetent adults [6, 9–11, 15], as in the case reported.
For this review, we will build on the most relevant items and features that in relation with the HFMD are described in the selected papers.
Recent studies suggest a strong association between HFMD and climate changes, as the incidence of the disease increases in the springtime, when our case occurred. However, the exact reason for this association has not been studied yet. Different studies show contradictions in temperatures, while Wang et al.  provides the greatest incidence range between 21.1 and 26.6 °C. A study by Hii et al.  cites data above 32 °C and in periods where the temperature difference between the minimum and the maximum is greater than 7 °C. Neither is rainfall a clear risk factor, since according to Wang et al.  there are more cases with high rainfall, while for others  there is a low incidence rate 0.5 % for rainfall above 75 mm (Table 2). The biological relationship between climate indicators and EV activity is quite complicated and different reports on the subject do not reveal the same results, so it deserves to be investigated in future studies to get better information on this relationship [2, 29].
As for sex, recent studies suggest a higher prevalence in males than in females [4, 26, 30]. In contrast, no significant differences have been demonstrated in the genre and viral load between mild and severe cases .
The main causative agents are CVA16 and EV71 . Moreover, outbreaks caused by CVA4, CVA5, CVA6, CVA9, CVA10, CVA12, CVB1, CVB3 and CVB5 have been observed [3, 9–11, 31–34]. Links have also been found between EV-4, HFMD and meningitis . There is a low incidence in the cases documented in Europe, with a greater predominance of CVA16 infections. In contrast, in Asian countries such as China, the actual incidence of this disease is much higher and it has been shown that there is a large predominance of the EV71 virus in these countries, in particularly genotype C4 where the cases appear to be more severe (Table 3).
Diagnosis and differential diagnosis
Diagnosing the disease is relatively easy by looking at the clinical features of the disease.
In oral mucosa, an enanthem appears after 1–2 days and on the soft palate, inner cheeks, gums, gingival–labial groove and tongue. In our case study, the lesions appeared in less common areas such as the hard palate, tonsillar pillars and the right buccal mucosa. It consists of 5–10 small vesicles, which are very painful, covered with a yellowish pseudomembrane and surrounded by an erythematous halo. They measure between 3 and 7 mm in diameter (typically 5 mm). The enanthem breaks, forming small ulcers, as the oral epithelium is thin, which allows the vesicles to break easily during movements associated with speech and chewing. These vesicles can hinder food consumption because the tongue may be swollen and painful  (Fig. 1).
Skin vesicles can vary in number from a few to 100. Characteristically, they appear on the sides and back of the fingers, around the nails, around the heel and on the palm of the hand and soles of the feet. Occasionally they can appear on the knees and buttocks. Skin lesions, in our case, appeared on the sides and backs of the fingers and toes of our patient, and appeared in the locations described elsewhere. It measures approximately 3–7 mm in diameter. They are surrounded by an erythematous halo. The vesicle wall is thin and may be preceded by a maculopapular rash. They move into vesicular stage and then go on to develop scabs and ulcers [6, 13] (Figs. 2, 3).
Histopathological examination of skin vesicles revealed the presence of intraepithelial vesicles, within which there are fibrin, epithelial cells and reticular degeneration balonica, neutrophils, mononuclear cells and eosinophilic proteinaceous content .
In the differential diagnosis of lesions on the oral mucosa, the lesions that should be considered are primary herpetic gingivostomatitis, herpangina, erythema multiforme, aphthous stomatitis and chickenpox. It is very important to establish a correct diagnosis to avoid prescribing inappropriate drugs [17, 35].
Although it is not a serious disease, an early diagnosis is important to avoid epidemics on the pediatric population. There must be communication between the different branches of medicine and dentistry. The role of the dentist is important, as he/she is one of the professionals who must help with diagnosis when the patient seeks professional advice for painful oral lesions. Another diagnostic method studied recently by Yu et al. is the use of IgM ELISA in EV71 and CVA16 infections to correctly identify the virus causing the disease in patients .
Cases of HFMD associated with onychomadesis have been documented. This relates to the fact that viral replication could damage the nail matrix and produce transient nail dystrophy. Although several cases have been documented for patients infected with CVA10, further studies are needed to determine the causative agent of HFMD associated with onychomadesis . It is not necessary to treat the nails in any way except by keeping the area clean and avoiding further injury. In all of the reported cases, the nail disorders resolved themselves spontaneously over the course of several weeks  (Table 4).
Complications have been cited on a neurological level, and early recognition of the children at risk is the key to reducing mortality and severe morbidity [7, 37, 38] (Table 3). It was therefore shown that administration of mannitol, methylprednisolone, IVIG and other supportive treatments may prevent the disease worsening in severe cases, and improve the rate of successful recovery in patients with nervous system complications  (Table 3).
It is worth noting the large number of reports on Asian patients with HFMD and severe neurological complications caused by EV71, which can rapidly progress to fulminant cardiorespiratory failure and death. All the above studies are consistent with the fact that EV71 is the virus most responsible for serious manifestations of HFMD, and children under 2–4 years are the main group at risk of such complications. However it has not yet been determined whether neutralizing antibody responses in the early stages of infection correlate with the clinical severity of the disease in patients with EV71 [40, 41] (Table 5).
In a meta-analysis by Li et al. , in mainland China and Taiwan, concluded that blood counts increased glucose and leukocytes in severe forms of the disease, are a tool that can help physicians to anticipate the diagnosis and treatment of these patients efficiently.
Fang et al. in 2014 , in a meta-analysis of Risk factors of severe HFMD, concluded that Duration of fever ≥3 days, body temperature ≥37.5 °C, lethargy, hyperglycemia, vomiting, increased neutrophil count, EV71 infection, and young age are risk factors for severe HFMD. A confirmed diagnosis at first visit to hospital can significantly decrease the risk of severe HFMD.
Recently, cellular receptors have been identified, along with host factors that stimulate EV71. Several lines of research suggest that the scavenger receptor class B, member 2 (SCARB2) plays a crucial role in EV71 infection and later development into severe forms of the disease .
The EV71 vaccine is also important for preventing infection. Recent studies show that both serotypes of human leukocyte antigen, HLA-A33 (class I) and HLA-DR17 (class II), have significant associations with EV71 infection, suggesting that cellular immune response may play an important role in human immunity against EV71 infection . It was also found that the most severe cases of EV71, characterized by pulmonary edema, had lower cell specific antigen cytokines (Th1) and a lower lymphocyte proliferation response to the EV71 antigen in comparison with milder cases. This suggests that cellular immune response correlates with the clinical severity of HFMD. Namely, induction of cellular and humoral immunity should be considered when developing vaccines and further analyzed in clinical trials . In 2010, effective antiviral agents and vaccines against this virus was under development , Another study, in 2012 presented the first construction and characterization of an infectious cDNA clone of CVA16. The availability of this infectious clone also improved virological investigations and CVA16 vaccine development . For 2015, formalin-inactivated EV71 (FI-EV71) vaccines have been developed evaluated in human clinical trials, and were found to elicit full protection against EV71, and bivalent FI-EV71/FI-CVA16 vaccines have been found to elicit strong neutralizing antibody responses against both viruses in animal models, but nevertheless, there is currently no approved vaccine or antiviral substance available for the prevention or treatment of EV71 infection [47, 48].
On another note, the HFMD patient is potentially contagious for the duration of the initial symptoms, until the vesiculobullous skin lesions disappear. Therefore, patients diagnosed with HFMD should be excluded from group participation until the fever and skin and mucosal lesions have disappeared. Furthermore, the virus is known to be shed in the feces for several weeks. It is therefore necessary for patients and family members to know that the disease is spread through direct contact with blisters and secretions from the nose and throat, as well as through hands or utensils contaminated with the feces or secretions of infected people. It is therefore important to emphasize washing hands well and to avoid sharing contaminated utensils. In the case we presented, up to four adults who were in direct contact with the infected child suffered from the disease, as in the case described by Shin et al. . To prevent the infection from spreading to children and vulnerable adults, doctors and dentists should be aware that HFMD can also occur in immunocompetent adults . It has also been shown that public health measures such as closing schools and hygiene campaigns are effective in reducing the incidence rate of HFMD .
Due to multiple pathogenic compositions, enteroviral recombination, co-infection, spreading and the lack of an effective vaccine, outbreaks of the infection can persist for a long time. It is therefore vitally important to carry out epidemic surveillance of this disease and its complications, and consequently clinicians should inform health authorities to promote citizen participation in dealing with large epidemics of HFMD [50, 51].
HFMD is a typical childhood illness, but it also occurs in adults, which should be kept in mind due to the possibility of outbreaks, with emphasis on medical history and the overall clinical picture, to avoid inadequate treatments with antibiotics.
Dentists have an advantage over other professionals in diagnosing the disease, as lesions in the oral cavity are the main symptoms that affect the patient, and the dentist is therefore frequently one of the first professionals to be consulted. Thus, knowledge of the disease and early detection prevents the infection from spreading to other children and adults. Similarly, dentists have a key role in educating patients by recommending good oral hygiene to minimize the spread of the disease.
A surveillance system to predict future outbreaks, appropriate public health measures and research into vaccine development are of vital importance to control HFMD.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images.
hand foot and mouth disease
scavenger receptor class B, member 2
formalin inactivated enterovirus 71
formalin inactivated coxsackievirus 16
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JLL and EJS conceived and designed the study. COC, AMV, MSR and AMR performed the review and the case report. COC, AMV and JLL wrote the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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Omaña-Cepeda, C., Martínez-Valverde, A., del Mar Sabater- Recolons, M. et al. A literature review and case report of hand, foot and mouth disease in an immunocompetent adult. BMC Res Notes 9, 165 (2016). https://doi.org/10.1186/s13104-016-1973-y
- Oral health
- Case report